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355 lines (313 loc) · 10.4 KB
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package com.jsoniter;
import com.jsoniter.spi.TypeLiteral;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class JsonIterator implements Closeable {
final static ValueType[] valueTypes = new ValueType[256];
InputStream in;
byte[] buf;
int head;
int tail;
boolean eof;
Map<String, Object> tempObjects = new HashMap<String, Object>();
final Slice reusableSlice = new Slice(null, 0, 0);
char[] reusableChars = new char[32];
Object existingObject = null; // the object should be bind to next
static {
for (int i = 0; i < valueTypes.length; i++) {
valueTypes[i] = ValueType.INVALID;
}
valueTypes['"'] = ValueType.STRING;
valueTypes['-'] = ValueType.NUMBER;
valueTypes['0'] = ValueType.NUMBER;
valueTypes['1'] = ValueType.NUMBER;
valueTypes['2'] = ValueType.NUMBER;
valueTypes['3'] = ValueType.NUMBER;
valueTypes['4'] = ValueType.NUMBER;
valueTypes['5'] = ValueType.NUMBER;
valueTypes['6'] = ValueType.NUMBER;
valueTypes['7'] = ValueType.NUMBER;
valueTypes['8'] = ValueType.NUMBER;
valueTypes['9'] = ValueType.NUMBER;
valueTypes['t'] = ValueType.BOOLEAN;
valueTypes['f'] = ValueType.BOOLEAN;
valueTypes['n'] = ValueType.NULL;
valueTypes['['] = ValueType.ARRAY;
valueTypes['{'] = ValueType.OBJECT;
}
public JsonIterator(InputStream in, byte[] buf) {
this.in = in;
this.buf = buf;
if (this.in == null) {
tail = buf.length;
}
}
public static JsonIterator parse(InputStream in, int bufSize) {
return new JsonIterator(in, new byte[bufSize]);
}
public static JsonIterator parse(byte[] buf) {
return new JsonIterator(null, buf);
}
public static JsonIterator parse(String str) {
return parse(str.getBytes());
}
public final void reset(byte[] buf) {
this.buf = buf;
this.head = 0;
this.tail = buf.length;
this.eof = false;
}
public final void reset(InputStream in) {
this.in = in;
this.head = 0;
this.tail = 0;
this.eof = false;
}
public void reset() {
reset(this.buf);
}
public final void close() throws IOException {
if (in != null) {
in.close();
}
}
final byte readByte() throws IOException {
if (head == tail) {
if (!loadMore()) {
return 0;
}
}
return buf[head++];
}
final boolean loadMore() throws IOException {
if (in == null) {
eof = true;
return false;
}
int n = in.read(buf);
if (n < 1) {
if (n == -1) {
eof = true;
return false;
} else {
throw reportError("loadMore", "read from input stream returned " + n);
}
} else {
head = 0;
tail = n;
}
return true;
}
final void unreadByte() throws IOException {
if (head == 0) {
throw new IOException("unread too many bytes");
}
head--;
}
public final JsonException reportError(String op, String msg) {
int peekStart = head - 10;
if (peekStart < 0) {
peekStart = 0;
}
String peek = new String(buf, peekStart, head - peekStart);
throw new JsonException(op + ": " + msg + ", head: " + head + ", peek: " + peek + ", buf: " + new String(buf));
}
public final String currentBuffer() {
int peekStart = head - 10;
if (peekStart < 0) {
peekStart = 0;
}
String peek = new String(buf, peekStart, head - peekStart);
return "head: " + head + ", peek: " + peek + ", buf: " + new String(buf);
}
public final boolean readNull() throws IOException {
byte c = nextToken();
if (c == 'n') {
IterImplSkip.skipUntilBreak(this);
return true;
}
unreadByte();
return false;
}
public final boolean readBoolean() throws IOException {
byte c = nextToken();
switch (c) {
case 't':
IterImplSkip.skipUntilBreak(this);
return true;
case 'f':
IterImplSkip.skipUntilBreak(this);
return false;
default:
throw reportError("readBoolean", "expect t or f, found: " + c);
}
}
public final short readShort() throws IOException {
int v = readInt();
if (Short.MIN_VALUE <= v && v <= Short.MAX_VALUE) {
return (short) v;
} else {
throw new JsonException("short overflow: " + v);
}
}
public final int readInt() throws IOException {
return IterImplNumber.readInt(this);
}
public final long readLong() throws IOException {
return IterImplNumber.readLong(this);
}
public final boolean readArray() throws IOException {
byte c = nextToken();
switch (c) {
case '[':
c = nextToken();
if (c == ']') {
return false;
} else {
unreadByte();
return true;
}
case ']':
return false;
case ',':
return true;
case 'n':
return false;
default:
throw reportError("readArray", "expect [ or , or n or ]");
}
}
final byte nextToken() throws IOException {
for (; ; ) {
for (int i = head; i < tail; i++) {
byte c = buf[i];
switch (c) {
case ' ':
case '\n':
case '\t':
case '\r':
continue;
}
head = i + 1;
return c;
}
if (!loadMore()) {
return 0;
}
}
}
public final String readString() throws IOException {
return IterImplString.readString(this);
}
public final byte[] readBase64() throws IOException {
return IterImplString.readBase64(this);
}
public final String readObject() throws IOException {
byte c = nextToken();
switch (c) {
case 'n':
IterImplSkip.skipUntilBreak(this);
return null;
case '{':
c = nextToken();
switch (c) {
case '}':
return null; // end of object
case '"':
unreadByte();
String field = readString();
if (nextToken() != ':') {
throw reportError("readObject", "expect :");
}
return field;
default:
throw reportError("readObject", "expect \" after {");
}
case ',':
String field = readString();
if (nextToken() != ':') {
throw reportError("readObject", "expect :");
}
return field;
case '}':
return null; // end of object
default:
throw reportError("readObject", "expect { or , or } or n");
}
}
public final float readFloat() throws IOException {
return IterImplNumber.readFloat(this);
}
public final double readDouble() throws IOException {
return IterImplNumber.readDouble(this);
}
public final BigDecimal readBigDecimal() throws IOException {
return new BigDecimal(IterImplNumber.readNumber(this));
}
public final BigInteger readBigInteger() throws IOException {
return new BigInteger(IterImplNumber.readNumber(this));
}
public final Any readAny() throws IOException {
return new Any(readAnyObject());
}
public final Object readAnyObject() throws IOException {
ValueType valueType = whatIsNext();
switch (valueType) {
case STRING:
return readString();
case NUMBER:
return readDouble();
case NULL:
return null;
case BOOLEAN:
return readBoolean();
case ARRAY:
ArrayList list = new ArrayList();
while (readArray()) {
list.add(readAnyObject());
}
return list;
case OBJECT:
Map map = new HashMap();
for (String field = readObject(); field != null; field = readObject()) {
map.put(field, readAnyObject());
}
return map;
default:
throw reportError("readAnyObject", "unexpected value type: " + valueType);
}
}
public final <T> T read(T existingObject) throws IOException {
this.existingObject = existingObject;
Class<?> clazz = existingObject.getClass();
return (T) Codegen.getDecoder(TypeLiteral.generateDecoderCacheKey(clazz), clazz).decode(this);
}
public final <T> T read(TypeLiteral<T> typeLiteral, T existingObject) throws IOException {
this.existingObject = existingObject;
return (T) Codegen.getDecoder(typeLiteral.getDecoderCacheKey(), typeLiteral.getType()).decode(this);
}
public final <T> T read(Class<T> clazz) throws IOException {
return (T) Codegen.getDecoder(TypeLiteral.generateDecoderCacheKey(clazz), clazz).decode(this);
}
public final <T> T read(TypeLiteral<T> typeLiteral) throws IOException {
String cacheKey = typeLiteral.getDecoderCacheKey();
return (T) Codegen.getDecoder(cacheKey, typeLiteral.getType()).decode(this);
}
public ValueType whatIsNext() throws IOException {
ValueType valueType = valueTypes[nextToken()];
unreadByte();
return valueType;
}
public void skip() throws IOException {
IterImplSkip.skip(this);
}
public static void enableStrictMode() {
Codegen.enableStrictMode();
}
}
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